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Eureka, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Woodford County, Illinois.

This Afternoon
81°F
Mostly Cloudy
Mostly cloudy, with a high near 81. South wind around 8 mph.

7-day forecast for Eureka

WhenTempForecastWindPrecip
This Afternoon 81°F Mostly Cloudy 8 mph S 14%
Tonight 68°F Mostly Cloudy then Chance Showers And Thunderstorms 7 mph SSW 34%
Sunday 75°F Chance Showers And Thunderstorms 6 to 14 mph NNE 50%
Sunday Night 57°F Chance Showers And Thunderstorms 12 to 15 mph NE 45%
Monday 65°F Rain Showers Likely 15 mph ENE 67%
Monday Night 53°F Chance Rain Showers 12 to 15 mph ENE 54%
Tuesday 64°F Chance Rain Showers 14 mph NE 54%
Tuesday Night 51°F Slight Chance Rain Showers then Mostly Cloudy 7 to 14 mph NE 15%
Wednesday 66°F Partly Sunny 8 to 12 mph NNE 3%
Wednesday Night 52°F Partly Cloudy 3 to 10 mph NNE 2%
Thursday 70°F Partly Sunny 7 mph NNE 2%
Thursday Night 55°F Mostly Cloudy 2 to 6 mph NE 10%
Friday 73°F Partly Sunny 3 to 7 mph NE 7%
Friday Night 54°F Partly Cloudy 6 mph NE 7%

Forecast source: National Weather Service (api.weather.gov) for Eureka (40.714, -89.277). Updated through the day.

Growing snapshot for Eureka

Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
5b

More local growing data for Eureka: nearby ZIP 61530 weather · frost dates · planting calendar · Illinois frost dates

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Climate data from the nearest NOAA station, Congerville 2Nw, Il (6.2 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.